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Genetic characterization of Botryotinia fuckeliana (Botrytis cinerea) field isolates coupling high resistance to benzimidazoles to insensitivity toward the N-phenylcarbamate diethofencarb

S. Pollastro and F. Faretra
Phytopathologia Mediterranea
Vol. 31, No. 3 (Dicembre 1992), pp. 148-153
Stable URL: http://www.jstor.org/stable/42685834
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Genetic characterization of Botryotinia fuckeliana (Botrytis cinerea) field isolates coupling high resistance to benzimidazoles to insensitivity toward the N-phenylcarbamate diethofencarb
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Abstract

Field isolates of Botryotinia fuckeliana (Botrytis cinerea) which displayed high resistance to benzimidazoles accompanied by insensitivity to diethofencarb were crossed with reference strains carrying Mbc1S or Mbc1HR alleles of the Mbc1 resistance gene to determine the genetic basis of their unusual phenotype. Genetic analysis of meiotic progeny showed that all field isolates were allelic with reference strains. Thus, in B. fuckeliana alleles of the Mbc1 gene cause high resistance to benzimidazoles but do not cause hypersensitivity to diethofencarb. Therefore, protection strategies with the mixture of carbendazim and diethofencarb should be aimed at reducing the selection pressure which favours mutants which are not controlled by both fungicides. Isolati di Botryotinia fuckeliana (Botrytis cinerea) che mostravano alta resistenza ai benzimidazolici accompagnata da insensibilità al diethofencarb sono stati incrociati con ceppi di riferimento portatori degli alleli Mbc1S o Mbc1HR del gene di resistenza Mbc1 per determinare le basi genetiche del loro inusuale fenotipo. L'analisi genetica di progenie meiotiche ha mostrato che tutti gli isolati erano allelici con i ceppi di riferimento. In B. fuckeliana, quindi, alleli del gene Mbc1 possono causare alta resistenza ai benzimidazolici senza causare ipersensibilità al diethofencarb. Le strategie di protezione con la miscela di carbendazim e diethofencarb dovrebbero pertanto mirare a ridurre la pressione di selezione che favorisce i mutanti non sensibili ad entrambi i fungicidi.

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